_FSMoveObjectToTrashSync is a symbol that is defined in an OS X system library. If it is missing, then you have some system corruption. Not being an OS X user, I cant advise you on how to fix it, some googling might help.

I rolled back to 0.8.62, which is perfectly working (including working Setup Wizard) with sending books to my Kindle.

With 0.8.62, ``calibre-debug -d'' isn't working though, so I think that it's unrelated to not being able to send books to the device.

More things that seem to be strange/broken in 0.8.63 in my installation:
- no categories (Authors, Languages, etc.) are visible on the left side
- no context menu while right-clicking on single books
- the column ``on device''/``in library'' is absent from the main table

I can accept my Mac OS X might be corrupted, but there happened something wrong between 0.8.62 and .63.